nice lil dialog.
on this line

set %drive $did(drive.properties,3)

no real need to make it a global var when a local will do the job.

also you may just as well change this line

dialog -dm drive.properties drive.properties

to

dialog $iif($dialog(drive.properties),-v,-dm) drive.properties drive.properties

just incase you have morons trying to opening it while it's already open so they dont get an error ;x